With underwire being the most common type of bra support, there are bound to be underwire styles that work perfectly under knits and tees. Underwires, which are sewn between layers of fabric under bra cups, can be constructed of actual metal wire, flexible or molded plastic, or plastic-coated metal. In tee-shirt bras, fabricated from one piece of modern high-tech material, the underwire can sometimes be completely invisible.
These modern materials are what make t-shirt bras possible--the seamless molded cup, often contoured for enhanced shape, lays smooth under knits. T-shirt bras may also have seamless sides and back for even more smoothing. The underwire support lifts and shapes, creating a youthful and trim silhouette under even the most uncompromising knit fabrics, perfect for your tees and tanks.